Westerville operates an MS4 stormwater program under Ohio EPA NPDES permit, regulated by Codified Ordinance Chapter 933. New development over 1 acre requires a SWPPP and post-construction BMPs. Illicit discharges to storm drains are prohibited; only rainwater allowed.
Westerville is a Phase II MS4 community under the Ohio EPA NPDES general permit OHC000005. Chapter 933 implements six minimum control measures including public education, illicit discharge detection, and post-construction stormwater management. Development disturbing 1 or more acres must submit a Storm Water Pollution Prevention Plan (SWPPP) and install permanent BMPs (detention basins, bioswales, porous pavement) sized for the water quality volume. Only uncontaminated rainwater may enter storm drains; dumping of yard waste, oil, soaps, or chemicals is prohibited. Residents should report illicit discharges to Public Service at 614-901-6740.
Illicit discharge: 1,000 dollar per day civil penalty under CO 933.99, plus cleanup costs. SWPPP violation on construction site: stop-work order, Ohio EPA referral, up to 10,000 dollar fine.
Westerville, OH
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